<template>
    <section class="loginContainer">
      <div class="loginInner">
        <div class="login_header">
          <h2 class="login_logo">硅谷外卖</h2>
          <div class="login_header_title">
            <a href="javascript:;" :class="{on : loginWay}" @click="loginWay = true">短信登录</a>
            <a href="javascript:;" :class="{on : !loginWay}" @click="loginWay = false">密码登录</a>
          </div>
        </div>
        <div class="login_content">
          <form @submit.prevent="login">
            <div :class="{on : loginWay}" @click="loginWay = true">
              <section class="login_message">
                <input type="text" maxlength="11" placeholder="手机号" v-model="phone">
                <button :disabled="!rightPhone" class="get_verification" 
                :class="{right_phone: rightPhone}" @click.prevent="getCode">
                {{computeTime>0 ? `已发送(${computeTime}s)` : '获取验证码'}}
                </button>
              </section>
              <section class="login_verification">
                <input type="tel" maxlength="8" placeholder="验证码" v-model="code">
              </section>
              <section class="login_hint">
                温馨提示：未注册硅谷外卖帐号的手机号，登录时将自动注册，且代表已同意
                <a href="javascript:;">《用户服务协议》</a>
              </section>
            </div>
            <div :class="{on : !loginWay}" @click="loginWay = false">
              <section>
                <section class="login_message">
                  <input type="tel" maxlength="11" placeholder="手机/邮箱/用户名" v-model="name">
                </section>
                <section class="login_verification">
                  <input type="text" maxlength="8" placeholder="密码" v-if="showPwd" v-model="pwd">
                  <input type="password" maxlength="8" placeholder="密码" v-else v-model="pwd">
                  <div class="switch_button" :class="showPwd ? 'on' : 'off'" @click="showPwd = !showPwd">
                    <div class="switch_circle" :class="{right:showPwd}"></div>
                    <span class="switch_text">{{showPwd ? 'abc' : '...'}}</span>
                  </div>
                </section>
                <section class="login_message">
                  <input type="text" maxlength="11" placeholder="验证码" v-model="captcha">
                  <img class="get_verification" src="http://localhost:4000/captcha" alt="captcha"
                  @click="getCaptcha" ref="captcha">
                </section>
              </section>
            </div>
            <button class="login_submit">登录</button>
          </form>
          <a href="javascript:;" class="about_us">关于我们</a>
        </div>
        <a href="javascript:" class="go_back" @click="$router.back()">
          <i class="iconfont icon-jiantou2"></i>
        </a>
      </div>

      <AlertTip :alertText="alertText" v-show="alertShow" @closeTip="closeTip"></AlertTip>
    </section>
</template>

<script>
    import AlertTip from '../../components/AlertTip/AlertTip.vue'
    import {reqSendCode,reqSmsLogin,reqPwdLogin} from '../../api'
    export default {
      data(){
        return {
          loginWay:true, //true表示短信登录,false代表密码登录
          computeTime:0,  //计时的时间
          showPwd: false, // 是否显示密码
          phone:'',  //手机号
          code:'', //短信验证码
          name:'',  //用户名
          pwd:'',   //密码
          captcha: '', // 图形验证码
          alertText:'', //提示文本
          alertShow: false, // 是否显示警告框
        }
      },

      computed:{
        rightPhone(){
          return /^1\d{10}$/.test(this.phone)
        }
      },

      methods: {
        // 异步获取短信验证码
        async getCode(){
          // 如果当前没有计时
          if(!this.computeTime){
            //启动定时器
            this.computeTime = 30
            this.intervalId = setInterval(()=>{
              this.computeTime--
              if(this.computeTime<=0){
                //停止计时
                clearInterval(this.intervalId)
              }
            },1000) 

            //发送ajax请求（向指定手机号发送验证码短信）
            const result = await reqSendCode(this.phone)
            if(result.code === 1){  // code=1代表失败
              // 显示提示
              this.showAlert(result.msg)
              // 停止计时
              if(this.computeTime){
                this.computeTime = 0
                clearInterval(this.intervalId)
                this.intervalId = undefined
              }
            }
          }
        },

        showAlert(alertText){
          this.alertShow = true
          this.alertText = alertText
        },

        // 异步登陆
        async login(){
          let result
          // 前台表单验证
          if(this.loginWay){  // 短信登录
            const {rightPhone,phone,code} = this
            if(!rightPhone){
              // 手机号不正确
              this.showAlert('手机号不正确')
              return
            }else if(!/^\d{6}$/.test(code)){
              // 验证必须是6位数字
              this.showAlert('验证必须是6位数字')
              return  //return后面的语句不会执行，用来结束程序
            }
            // 发送ajax请求短信登录
            result = await reqSmsLogin(phone,code)

          }else{  //密码登录
            const {name,pwd,captcha} = this
            if(!name){
              // 用户名必须指定
              this.showAlert('用户名必须指定')
              return
            }else if(!pwd){
              // 密码必须指定
              this.showAlert('密码必须指定')
              return
            }else if(!captcha){
              // 验证码必须指定
              this.showAlert('验证码必须指定')
              return
            }
            // 发送ajax请求密码登录
            result = await reqPwdLogin({name,pwd,captcha})
          }

          // 停止计时
          if(this.computeTime){
            this.computeTime = 0
            clearInterval(this.intervalId)
            this.intervalId = undefined
          }

          // 根据结果数据处理
          if(result.code === 0){
            const user = result.data
            // 将user保存到vuex的state
            this.$store.dispatch('recordUser',user)
            // 去个人中心界面
            this.$router.replace('/profile')
          }else{
            // 显示新的图片验证码
            this.getCaptcha()
            // 显示警告提示
            const msg = result.msg
            this.showAlert(msg)
          }
        },
        // 关闭警告框
        closeTip(){
          this.alertShow = false
          this.alertText = ''
        },
        // 获取一个新的图片验证码
        getCaptcha(){
          this.$refs.captcha.src = 'http://localhost:4000/captcha?timer='+Date.now()
        }
      },

      components:{
        AlertTip
      }
    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
    .loginContainer
      width 100%
      height 100%
      background #fff
      .loginInner
        padding-top 60px
        width 80%
        margin 0 auto
        .login_header
          .login_logo
            font-size 40px
            font-weight bold
            color #02a774
            text-align center
          .login_header_title
            padding-top 40px
            text-align center
            >a
              color #333
              font-size 14px
              padding-bottom 4px
              &:first-child
                margin-right 40px
              &.on
                color #02a774
                font-weight 700
                border-bottom 2px solid #02a774
        .login_content
          >form
            >div
              display none
              &.on
                display block
              input
                width 100%
                height 100%
                padding-left 10px
                box-sizing border-box
                border 1px solid #ddd
                border-radius 4px
                outline 0
                font 400 14px Arial
                &:focus
                  border 1px solid #02a774
              .login_message
                position relative
                margin-top 16px
                height 48px
                font-size 14px
                background #fff
                .get_verification
                  position absolute
                  top 50%
                  right 10px
                  transform translateY(-50%)
                  border 0
                  color #ccc
                  font-size 14px
                  background transparent
                  &.right_phone
                    color black
              .login_verification
                position relative
                margin-top 16px
                height 48px
                font-size 14px
                background #fff
                .switch_button
                  font-size 12px
                  border 1px solid #ddd
                  border-radius 8px
                  transition background-color .3s,border-color .3s
                  padding 0 6px
                  width 30px
                  height 16px
                  line-height 16px
                  color #fff
                  position absolute
                  top 50%
                  right 10px
                  transform translateY(-50%)
                  &.off
                    background #fff
                    .switch_text
                      float right
                      color #ddd
                  &.on
                    background #02a774
                  >.switch_circle
                    //transform translateX(27px)
                    position absolute
                    top -1px
                    left -1px
                    width 16px
                    height 16px
                    border 1px solid #ddd
                    border-radius 50%
                    background #fff
                    box-shadow 0 2px 4px 0 rgba(0,0,0,.1)
                    transition transform .3s
                    &.right
                      transform translateX(30px)
              .login_hint
                margin-top 12px
                color #999
                font-size 14px
                line-height 20px
                >a
                  color #02a774
            .login_submit
              display block
              width 100%
              height 42px
              margin-top 30px
              border-radius 4px
              background #4cd96f
              color #fff
              text-align center
              font-size 16px
              line-height 42px
              border 0
          .about_us
            display block
            font-size 12px
            margin-top 20px
            text-align center
            color #999
        .go_back
          position absolute
          top 5px
          left 5px
          width 30px
          height 30px
          >.iconfont
            font-size 20px
            color #999
</style>